Includes: 4 m silicon hose, 2 air stones, 1 adjuster, Y connector and 2 safety valves

Turns a single airline into 2 outlets, each with its own control valve. Leak proof precise flow control Prevents water return For fresh or saltwater use

Helps to protect air pumps from water damage Protects air pumps from damaging backsiphoming Prevents water from siphoning through airline Low restistance to air flow Installs anywhere in air line

Fits 4mm airline

Fits 4mm airline